Buggy code:
@ SuppressWarnings ( "unchecked" ) public class DescHelper { private static final Printer printer = new Textifier ( ) ; private static final TraceMethodVisitor mp = new TraceMethodVisitor ( DescHelper . printer ) ; public static boolean isPublic ( int mod ) { } public static boolean isProtected ( int mod ) { } public static boolean isPrivate ( int mod ) { } public static boolean isStatic ( int mod ) { } public static boolean isAbstract ( int mod ) { } public static boolean isFinal ( int mod ) { } public static boolean isSynthetic ( int mod ) { } public static boolean isVolatile ( int mod ) { } public static boolean isBridge ( int mod ) { } public static boolean isSynchronized ( int mod ) { } public static boolean isInterface ( int mod ) { } public static boolean isEnum ( int mod ) { } public static boolean isAnnotation ( int mod ) { } public static boolean isDeprecated ( int mod ) { } public static boolean isVoid ( String desc ) { } public static boolean isBoolean ( String desc ) { } public static boolean isChar ( String desc ) { } public static boolean isByte ( String desc ) { } public static boolean isShort ( String desc ) { } public static boolean isInt ( String desc ) { } public static boolean isFloat ( String desc ) { } public static boolean isLong ( String desc ) { } public static boolean isDouble ( String desc ) { } public static boolean isArray ( String desc ) { } public static boolean isObject ( String desc ) { } public static boolean isMethodReturnTypeGeneric ( String desc ) { } public static boolean isFieldGeneric ( String desc , String signature ) { } public static String getVersion ( int java ) { } public static String insnToString ( AbstractInsnNode insn ) { } public static String classAccessLevelToString ( int access ) { StringBuilder sb = new StringBuilder ( ) ; if ( DescHelper . isPublic ( access ) ) { sb . append ( "public<seq2seq4repair_space>" ) ; } else if ( DescHelper . isProtected ( access ) ) { sb . append ( "protected<seq2seq4repair_space>" ) ; } else if ( DescHelper . isPrivate ( access ) ) { sb . append ( "private<seq2seq4repair_space>" ) ; } if ( DescHelper . isStatic ( access ) ) { sb . append ( "static<seq2seq4repair_space>" ) ; } if ( DescHelper . isFinal ( access ) ) { sb . append ( "final<seq2seq4repair_space>" ) ; } else if ( DescHelper . isAbstract ( access ) ) { sb . append ( "abstract<seq2seq4repair_space>" ) ; } if ( DescHelper . isAnnotation ( access ) ) { sb . append ( "@interface<seq2seq4repair_space>" ) ; } else if ( DescHelper . isInterface ( access ) ) { sb . append ( "interface<seq2seq4repair_space>" ) ; } else if ( DescHelper . isEnum ( access ) ) { sb . append ( "enum<seq2seq4repair_space>" ) ; } else { sb . append ( "class<seq2seq4repair_space>" ) ; } <START_BUG> return sb . toString ( ) . trim ( ) ; <END_BUG> } public static String [ ] methodNodeAnnotations ( MethodNode node ) { } public static String [ ] fieldNodeAnnotations ( FieldNode node ) { } public static String [ ] classNodeAnnotations ( ClassNode node ) { } private static String [ ] annotationListToStringArray ( List < AnnotationNode > annotationsList ) { } public static String classToString ( ClassDesc c ) { } public static String fieldToString ( FieldDesc f ) { } public static String methodToString ( MethodDesc m ) { } public static String betterClassAnalyserToString ( BetterClassAnalyser analyser ) { } }

Fix:
return sb . toString ( ) ;